Electric vulcanizer



Feb. 18, 1930. o. c. DENNIS ELECTRIC VULCANIZER Filed Feb. 4, 1927 Patented Feb.-18, 1930 PATENT; OFFICE CLIVER DENNIS, OF WILMETTE, ILLINOIS ELECTRIC V'ULCANIZER Application filed February 4, 1927. Serial no. 165,872.

My invention relates to electric vulcanizers and has to do more particularly with the provision of a vulcanizing or heating unit adapted for application to articles to be vulcanized, and more particularly irmer tubes, by

the use of a C clamp. Such devices are carried as portable sets in the tool kit of the car and must be light, positive in operation,

cheap to manufacture and preferably opera-.

tive from the battery of thecar.

An object of my invention is to provide a vulcanizer of this type which is simple in construction, compact in arrangement so as to provide the most effective heating, cheap to manufacture and portable or readily interchangeable with removable terminal clips readily applicable to the device although used in close quarters such as where applied by a C clamp. There are Various other features and these will be more particularly pointed out in the ensuing part of the specification and appended claims.

For a better understanding of my invention reference is to be had to the accompanying drawing, in which- Fig. 1 is a side elevation of the vulcanizer heat unit shown in fulllines with the C clamp I and tube shown in dotted lines;

Fig. 2 is a side elevation of the device with one-half thereof shown in section;

Fig. 3 is a side elevation of the spring ter-v minal clip;

Fig. 4 is a'right end elevation of Fig. 3; and

Fig. 5 is a sectional View along the line 5-5 of Fig. 4.- showing more in detail the method of applying the conductor terminal to the clip.

Referring now more in detail to the prement is held in intimate relation therewith without intervening air spaces to prevent the full application of the heat. In the arrange- -ment shown I use an insulating washer 8 tect the heat insulation plate 10, the element I 11 being of suitable heat resistant material. In the preferred device I use a disk 11 of sheet steel. The rear portion B of the casing has a central indented portion 12 adapted to receive the clamping screw 13 of the C clamp 14.- for clamping the device against the tube 15 or other element which is to be vulcani'zed. For instance, in patching an inner tube as 15 the patch is placed between the tube and vulcanizing face of the device, which is concave so as to fit over the patch. Now as to the rear portion B, this is preferably cupped -so as to provide a terminal space 16 through which the conductor terminals of theheat element pass to the terminal post.

There are a number of advantages in the terminal and construction arrangement of my device, in that by placing the terminal posts upon the rear cup the terminal conduc torsof the heating element are connected to the posts and this permits bending or forming the heating element and its protective disks so as to conform to the rounded face of the device and be pressed into intimate relation therewith.

As to the terminal post used this is in the form of a tubular post 17 insulatingly secured to the rear cup preferably by insulatin washers 18 with the end 19 of the post turned over to bind the parts together. Thus the terminal posts are secured to the rear cup before the casing is assembled. By using a tubular post with a passage therethrough the terminal conductors 20 of the heating element are slipped up into the passage through the terminal post and the rear cup B then placed into the front cup A over the heat element and protective disks. The conductors 20 exthe post and hold it in intimate electrical readily connected to and disconnected from the conductor is inserted.

the power wires which may be conductors used for other purposes on the car or be permanently connected with a battery source and coiled up in the car at some accessible place but with the heating element permanently attached thereto. This spring clip is in the form of a polygonal sheet metal member, preferably a triangular portion 22 having overlapping ends 23-24 with openings 2526 respectively therein. With the clip disconnected from the terminal these openings 24-25. are normally non-registering, but by pressing the clip together until these openings register, the device may be slip ed over the end of the terminal post unti .the overlapping ends snap into the annular recess 27 by which the clip is retained on the post. To release the clipit is only necessary to press it together until the openings register sufficiently to permit withdrawal of the cli over the post. To fasten the electrical conductor to the clip I provide an extension 28 adapted to be wrapped around and clipped onto the conductor as 29 and one wall of the clip is sheared so as to provide an offset portion 30 under which theend 31 of Thereafter the port-ion 30 is pressed downwardly toward the wall of the c ip, thereby holding this end 31 in the clip and also in intimate electrical contact with the device.

What I claim as new and desire to secure by United States Letters Patent is 1. In an electricvulcanizer, a sheet metal heat element enclosing casing having a cupped back wall shaped to provide a terminal conductor space therein, a heating element in the casing, and tubular terminal members insulati-ngly secured in the back wall where it is shaped to receive them and having a passage extendmg therem to. recelve terminal conductors from the heating element. 2'. In an electric vulcamzer, a sheet metal heat element enclosing casing having a cupped back Wall shaped to provide a terminal eonductor space therein, a heatingelelnent in the casing, and tubular terminal memhers'insulatingly secured to the back wall and having a passage extending therein to receive terminal conductors from the heating element, said terminal members being compresse by force 3. In an electric vulcanizer a. sheet metal.

casing comprising front and rear cupped portions, one of said members being shaped to be placed into the cup of the other to be clamped therein, an electrical'heating element ositioned between thefront and rear casmg members to be clamped therebetween, and a pair of tubular terminals insulatingly secured in the rear casing portion each with a passage extending therethrou'gh to receive a terminal conductor of the heating element to. permit drawing such conductor out through the passage until taut when the cup ductor are clamped together.

portions and heating element terminal con- 4. In an electricvulcanizer, a sheet metal cupped front member having a concavo-convex face plate w1tha concave patch recelvmg element, and a cup-shaped rear cap set into the side wall of the front member and said plates being pressed into intimaterelation with each other, with the heating element and the inner convexo face of the front-member held together by aturned in flange of the side wall of said front member.

5. In an electric vulcanizer, a sheet metal casing having front and rear cupped portions, the front cupped portion having a concavoconvex face, a mica sheet in contact with the full inside portion of said face and having the same curvature, a heating element contoured to lie against the mica disk throughout, a heat insulating disk having the same contour as the mica disc and engaging the opposite side of the heating element, with apertures therein through which terminals of the heating element extend, a metal washer in back of the heat insulating disk, the rear cupped casing having a flange-like edge lying on top of the metal washer, and the front casing being turned over to clamp the two face, a heating element, heat and electrical insulating plates placed adjacent the heating casings together, and maintain the front casing face, mica disk, heating element, and heat insulating washer in intimate contact, and terminal posts on the rear casing for receiving the heating element terminals in clamping relation.

6. In an electric vulcanizer, a sheet metal casing having front and rear cupped portions, the front cupped portion having a concavoconvex face, a mica sheet in contact with the full inside portion of said face and having the same curvature, a heating element .contoured to lie against the mica disk throughout, a heat insulating disk having the same contouras the mica disc and engaging the opposite side of the heating element, with apertures therein through which terminals of the heating element extend, a metal washer in back of the heat insulating disk, the rear cupped casing having a flange-like edge lying ing on top of the metal washer, and the front casing being turned over to clamp the two casings together, and maintain the front casing face, mica disk, heating element, and heat insulating washer in intimate contact, terminal posts on the rear casing for receiving the heatmg element terminals in clamping relation, sald terminal posts comprising tube like members clamped into posltion on the casing in apertures thereon with insulating washers between the post and the casing, the wire being clamped by the colla sed side wall of the tube and extending taut etween the tube and the heating element.

7. In an electrical vulcanizer a two part casing, one part with a concavo-convex surface for engaging a patchand the other part cup shaped to extend above the first part, a heating element held adjacent said concavoconvex; surface, and tubular terminal elements insulatingly secured in-holes in the cup shaped portion 0 the casing with a continuing passageway from the inside to the outside of the casing thru each tubular terminal,

t'he leads from the heating element being extended into said passageways and held therein in contact with the terminal by the partial collapsing of the portion of the tube on the outside ofthe casing.

8. In an electrical vulcanizer a two part casin one part with a concavo-convex surface or engaging a patch and the other part cup shaped to extend above the first part, a heating element held adjacent said concavoconvex surface, and tubular terminal elements insulatingly secured in holes in the cup shaped portion of the casing with a continupassageway from the inside to the outside of the casing thru each tubular terminal, the leads from the heating element being extended into said passageways and held therein in contact with the termlnal by the partial collapsing of the portion of the tube on the outside of the casing, electrical connection 

